NJ7P SQL Tube Database Query

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6LQ8
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6KR8
Substitutes ................................... 6CX8 6JT8 6KV8
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in tv receivers. The triode is used in sync-separator and sound-if amplifier circuits. The pentode is used as a video output tube. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-6 1/2
EIA Outline ................................... 6-3
EIA Base ...................................... 9DX

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.7 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 14 pf
Output ........................................ 4.8 pf
Grid to Plate ................................. 0.12 pf

Triode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 4.2 pf
Output ........................................ 2.4 pf
Grid to Plate ................................. 2.8 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 5 W
Grid No. 2 Dissipation ........................ 1 W

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 68 Ω
Amplification Factor .......................... 46
Plate Resistance (approx) ..................... 4.4K Ω
Transconductance .............................. 10400 µ
Plate Current ................................. 15 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 82 Ω
Plate Resistance (approx) ..................... 55K Ω
Transconductance .............................. 21000 µ
Plate Current ................................. 16.5 mA
Grid No. 2 Current ............................ 3.1 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 68 Ω
Plate Resistance (approx) ..................... 75K Ω
Transconductance .............................. 23000 µ
Plate Current ................................. 20 mA
Grid No. 2 Current ............................ 3.5 mA

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Sat, 25 Mar 2023 20:47:10 -0700